OPO Laser Tunable Pulsed System

The optical parametric oscillator (OPO) has emerged as a solid-state alternative to the tunable dye laser. An OPO relies on a nonlinear optical process termed parametric downconversion. In an appropriate type of nonlinear crystal (e.g., LBO or BBO), an input photon is split to produce two photons of lower energy – referred to as the signal and idler photons – where the sum of the two photons conserves the original photon energy. By definition, the signal has higher photon energy than the idler.

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